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Farmall & IHC Tractors Discussion Forum
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how much off farmall H Block?

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Nick Friend

11-05-2004 08:18:28




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I want to mill my farmall H Head and block to raise compression. What is the max I can take off in thousands?




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Dale L

11-06-2004 06:23:44




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 Re: how much off farmall H Block? in reply to Nick Friend, 11-05-2004 08:18:28  
I just had my block plained because of pitting around the "water ports" where the head gasket sits on the block. I had to take of .040 to fix it. It cost $130 and they had to rebore the counter bore. I would avoid milling the block if possible. Heads are eazier to come by and cheaper than finding a new block. my $.02 worth



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K.B.-826

11-05-2004 20:13:54




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 Re: how much off farmall H Block? in reply to Nick Friend, 11-05-2004 08:18:28  
The guys who said not to mill the block are right. If you do that, you'll also have to mill the counterbore, (area where the flange of the sleeve seats) or the sleeves will stick out too far. Milling the counterbores is very expensive.



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26Red

11-05-2004 12:01:42




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 Re: how much off farmall H Block? in reply to Nick Friend, 11-05-2004 08:18:28  
Look for ChadS on the puller's board- he is the H engine guru. Depending on the type of cylinder head you have, you can mill quite a bit off(gas or distillate).



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rustyfarmall

11-05-2004 08:43:31




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 Re: how much off farmall H Block? in reply to Nick Friend, 11-05-2004 08:18:28  
Absolutely no more than is necessary to achieve flatness. .025" to .050" on the head if necessary. If you go more that that amount, the head will be toast the next time it needs milled. Leave the block alone. If you really need to raise compression, look at pistons.



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ChadS

11-06-2004 07:38:00




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 Re: how much off farmall H Block? in reply to rustyfarmall, 11-05-2004 08:43:31  
I am going to have to side with Rusty on this one. You can mill the block, but dont do it to build compression. Just deck the block, with the sleeves in the block, and mill the block deck flat. Just enough to true up the warpage on the block deck, no more. What casting number is your cyl head? 8043D, 8043DD, and the 300-350 heads, most can have .200 milled off pretty easy, and still have plenty of meat left over to be reliable inthe fields still,, Main thing to remember about milling cyl heads, is not to get the head plate too thin. Measure the thickenss at the triangle water ports, and keep the plate thickeness no thinner than .300 on a working farm tractor. What ever is beyond .300, is what you can mill off the head safely. ChadS

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Carp

11-05-2004 08:41:52




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 Re: how much off farmall H Block? in reply to Nick Friend, 11-05-2004 08:18:28  
I am not an expert, but you do not want to mill the block. You want to mill the head and how much depends on which head it has and which pistons you plan to use. The resident experts will be able to give you the answer you are looking for, but they will need the information above first.



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